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		<title>three.js webgl - parametric geometries</title>
		<meta charset="utf-8">
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		<link type="text/css" rel="stylesheet" href="main.css">
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		<div id="container"></div>
		<div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - parametric geometries</div>

		<script type="module">

			import * as THREE from '../build/three.module.js';

			import Stats from './jsm/libs/stats.module.js';

			import { Curves } from './jsm/curves/CurveExtras.js';
			import { ParametricGeometry } from './jsm/geometries/ParametricGeometry.js';
			import { ParametricGeometries } from './jsm/geometries/ParametricGeometries.js';

			let camera, scene, renderer, stats;

			init();
			animate();

			function init() {

				const container = document.getElementById( 'container' );

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 2000 );
				camera.position.y = 400;

				scene = new THREE.Scene();

				//

				const ambientLight = new THREE.AmbientLight( 0xcccccc, 0.4 );
				scene.add( ambientLight );

				const pointLight = new THREE.PointLight( 0xffffff, 0.8 );
				camera.add( pointLight );
				scene.add( camera );

				//

				const map = new THREE.TextureLoader().load( 'textures/uv_grid_opengl.jpg' );
				map.wrapS = map.wrapT = THREE.RepeatWrapping;
				map.anisotropy = 16;

				const material = new THREE.MeshPhongMaterial( { map: map, side: THREE.DoubleSide } );

				//

				let geometry, object;

				geometry = new ParametricGeometry( ParametricGeometries.plane( 100, 100 ), 10, 10 );
				geometry.center();
				object = new THREE.Mesh( geometry, material );
				object.position.set( - 200, 0, 200 );
				scene.add( object );

				geometry = new ParametricGeometry( ParametricGeometries.klein, 20, 20 );
				object = new THREE.Mesh( geometry, material );
				object.position.set( 0, 0, 200 );
				object.scale.multiplyScalar( 5 );
				scene.add( object );

				geometry = new ParametricGeometry( ParametricGeometries.mobius, 20, 20 );
				object = new THREE.Mesh( geometry, material );
				object.position.set( 200, 0, 200 );
				object.scale.multiplyScalar( 30 );
				scene.add( object );

				//

				const GrannyKnot = new Curves.GrannyKnot();

				const torus = new ParametricGeometries.TorusKnotGeometry( 50, 10, 50, 20, 2, 3 );
				const sphere = new ParametricGeometries.SphereGeometry( 50, 20, 10 );
				const tube = new ParametricGeometries.TubeGeometry( GrannyKnot, 100, 3, 8, true );

				object = new THREE.Mesh( torus, material );
				object.position.set( - 200, 0, - 200 );
				scene.add( object );

				object = new THREE.Mesh( sphere, material );
				object.position.set( 0, 0, - 200 );
				scene.add( object );

				object = new THREE.Mesh( tube, material );
				object.position.set( 200, 0, - 200 );
				object.scale.multiplyScalar( 2 );
				scene.add( object );

				//

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild( renderer.domElement );

				stats = new Stats();
				container.appendChild( stats.dom );

				window.addEventListener( 'resize', onWindowResize );

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function animate() {

				requestAnimationFrame( animate );

				render();
				stats.update();

			}

			function render() {

				const timer = Date.now() * 0.0001;

				camera.position.x = Math.cos( timer ) * 800;
				camera.position.z = Math.sin( timer ) * 800;

				camera.lookAt( scene.position );

				scene.traverse( function ( object ) {

					if ( object.isMesh === true ) {

						object.rotation.x = timer * 5;
						object.rotation.y = timer * 2.5;

					}

				} );

				renderer.render( scene, camera );

			}

		</script>

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